Ohio 41,546 Oregon 29,169 Ontario 24,988 Oklahoma 15,836 Oceania 10,992 Outer space 5,675 Oxford 5,029 OECD countries 4,981 Oman 4,340 Odisha 3,160 Orient 2,589 Okinawa-ken 2,476 Oxford (England) 2,292 Ohio River Valley 2,161 Okinawa-ken (Japan) 2,084 Orissa 2,063 Osaka 1,865 Oaxaca (State) 1,819 Orange County 1,707 Oakland 1,637 Ohio River 1,560 Oaxaca (Mexico : State) 1,396 Odisha (India) 1,376 Odesa 1,331 Osaka (Japan) 1,308 Orissa (India) 1,249 Osmanisches Reich 1,224 Odesa (Ukraine) 1,203 Oslo 1,054 Oaxaca 1,043 Oakland (Calif.) 1,014 Oxfordshire 898 Ottawa 883 Oxfordshire (England) 880 Okinawa Island 851 Oregon Territory 849 Osteuropa 782 Oregon National Historic Trail 752 Ouganda 747 Orkney (Scotland) 727 Ozark Mountains 670 Omaha 644 Old Northwest 639 Orkney 603 Oslo (Norway) 568 Österreich 554 Omaha (Neb.) 548 Ostfriesland 544 Odessa 540 Orange County (Calif.) 527 Ostfriesland (Germany) 508 Osaka (Prefecture) 499 Ottawa (Ont.) 483 Oahu 476 Oldenburg 466 Okayama-ken 464 Ostasien 464 Okinawa Island (Japan) 459 Oceania Region 453 Ostroh 451 Oklahoma City 449 Okayama-ken (Japan) 445 Osaka (Japan : Prefecture) 442 Occident 415 Onondaga County 414 Ohio River Region 398 Océanie 392 Oświęcim 379 Oneida County 357 Ontario, Lake (N.Y. and Ont.) 356 Old Southwest 335 Oświęcim 328 Oudh (India) 324 Omsk 321 Oklahoma City (Okla.) 308 Orvieto 307 Onondaga County (N.Y.) 291 Orange County (N.Y.) 291 Oudh 289 Orenburgskai︠a︡ oblastʹ (Russia) 287 Ontario, Northern 286 Orange 282 Ostia (Extinct city) 282 Oldenburg (Germany) 275 Oran 274 Oran (Algeria) 272 Orlovskai︠a︡ oblastʹ 272 Osnabrück (Germany) 272 Oder-Neisse Line (Germany and Poland) 270 Oaxaca de Juárez (Mexico) 267 Orléans 267 Orléans (France) 267 Osnabrück 266 Oberpfalz 264 Omsk (Russia) 264 Orlando 264 Olomouc 263 Olympic National Park (Wash.) 263 Oneida County (N.Y.) 254 Ozark Mountains Region 253